Hey Folks, Welcome to another episode of pricing or savings plan on AWS. Most of you must have heard or even used AWS Savings Plan for assessing your benefits on committing long term to your compute or ec2
From my experience(actually pondering over for making decisions) I found the below facts and sharing here, hoping that this gives immediate boost & confidence to those who start "AWS Savings Plans" now or after
Findings
Compute savings plan is for committing long term either 1 or 3 years with Region (and Local Zone or Wavelength Zone), Tenure, OS type & payment options
Not all instance types available between Region & Local Zone selections
EC2 Instance savings plan has "Instance Family" in addition to the filters available in "Compute Savings Plan" and that is the main difference between Compute & EC2 plans
Compute Savings Plan for Fargate - is available Region only(makes sense). CPU Architecture filter is provided to choose from x86 or ARM
Savings plan state changes like " Active" or "Retired" can be alerted using AWS EventBridge events
Savings will be utilized to the instance with highest discount percentage
Savings plan utilization can be viewed from "AWS Cost Management Console" -> Savings Plans -> Inventory view
AWS Account can have multiple savings plan and can be renewed as well
Before purchasing a savings plan with "Compute" or "EC2", looking into the "Recommendations" will actually help, as "Savings Plans" -> "Recommendations" is based on usage history
Commitment cannot be cancelled during the term
AWS Lambda Requests doesn't give you any savings over on-demand
Savings plan will be utilized after completing free-tier hours, if any
Finally, to well utilize the savings plan, define the "Hourly Commitment" as appropriate as possible
Example:
Instance: u-3tb1.56xlarge
Utilization: 24 hrs a day
Utilization Hrs/Month: 2 servers * 24 hours * 31 days = 1488 hours
Savings Plan Rate: $10.52
On-demand Rate: $27.30
Hourly commitment should be: $10.52*2 = $21.04
Because (21.04 / (10.52*2))*1488 = 744 hours full utilization of SP Rate for servers
Hope these pointers help people as a heads up for their savings plan activity
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